16:30 Language and Communication II / Computational Models (chair: Thora Tenbrink)Spatial References with Gaze and Pointing in Shared Space of Humans and RobotsPatrick Renner, Thies Pfeiffer and Ipke WachsmuthSpatial Planning: An ACT-R Model for the Tower of London TaskRebecca Albrecht and Marco RagniSpatial Numerosity: A Computational Model Based on a Topological InvariantTobias Kluth and Christoph Zetzsche